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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfda4ad3fa4a244ba50b8ffa4a72e1e8dfdf0188f9e2bdf0242e6c0184c28ebb' 
  AND token = 'dNeWG5dJaUTY27bqDnApU3Dix1QaU8ULLbtkB92Co6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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