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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7230156d7c12f16c83ee47776c807864672032dcd457633711371cb82d899a1' 
  AND token = 'LPNu0crit8qTWluPDcxVbeUtigo7Cb9Cql0tCYRYywo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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