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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a294c7c05a80598206175424a3305539436d1732044941282c8f30285015787d' 
  AND token = 'QhYbytA9rpmoKYWjwdR9rYuO6bSbBs0CRVPtUuSQR0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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