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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e5e139185c501fd1a7c3b90ee7847b8e3328018d4ed59c897a7373622cdd3d8' 
  AND token = 'TgpYpb8OVY4qlER7+6Z0mRCcXRmpxy79mpC2cLSPQVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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