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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4df1e9044b27ff5bd4903905635a352bbcd5c77c8b47bd7ecfc9bb6f70f3192d' 
  AND token = 'SqmSdrT9HeTY7MIam3RFKkjM6Dj4VqEN82p89IByiuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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