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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c976f0a038cd845aac0a9878ffb9a392b05341a89c4ca273799502f720540b0b' 
  AND token = 'DTLRGbdnnHrpSKpCmqQMUZ8KEYv9tHpVW1ETQ5FH8l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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