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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc6b44309a44f81d7332d6b982d69f1ee17c00c4c3cf7c03d2089eb2c8a7ce69' 
  AND token = 'c9DI2W/HKLPTed8XZDOkwVdZCPSdV2YD9Su/kDIW8IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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