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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '454f0a642ebc9caed67e4012f12fae57e990062c73320d26c8841fd31186efc4' 
  AND token = 'o1nCEIrBIpV9pGOO8s7ceV5uWgqbIsQSKwG+krRlBKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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