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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3857ca38f49f7412d2c5358f2c77a25c8c71a44b0f83eb696c2e9a2f1c6eb6c' 
  AND token = '9l+MaBMW9l+E1Jkf3CkzlUDofziOQgTPJl8OULENwLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}