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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1952691f7f658596d52af1e61fe27c27dad143a43be3ebf0b79b827d15da4cfc' 
  AND token = '6BCiGOFf3JC2sMRIBt1n8/vDGEW6I5746BVmeY1JzMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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