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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50895598ccba73537192c11e1767ec2b7798a82e1a9c95f5e6e8c9a1f5eedc7e' 
  AND token = 'w08xZbzytZmzg/Iw8onIXElQ4sVMB7fL+8qqiyf4NXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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