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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99c326980d61b0e6eb17a24b3aacebb823a8d17146d4f59d003ac17f752587a0' 
  AND token = 'QsfNkUfi7UzsoiJ4pKKec5ZAKDoKJa9XpvLpebE4al4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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