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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c37d0c0f51a19cc1e06e8468a7ac4e46af3bc07d8831cda056bdd2c5d763189d' 
  AND token = 'W6YvdEbULNZMSurust3a7Ic1FGsGXQe3TdK5nOPF6W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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