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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd801d9ee1f98750e30c575d74b0878febb3573cd839fe850a0a3d41aad68a60' 
  AND token = 'dBVwonsLjGQchkdd+N4N5J/xt6B7B6qiT5oP2RA5HoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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