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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a49b084422a8b727efe13cb86b1170788efa6e1835fdbf92b84261c40440423' 
  AND token = 'DAb7dX0UUXZvv8iNyZ16Nfe18keazD6GrxXmtCZFUk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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