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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f72886761a5ed4f8e996ed5e577f546dc790cf26577268e7ff6011d565dbe0b' 
  AND token = 'oS2H1EFNSHrVGn1ANjvqenNAWKsIpsh4esjhcv14ghM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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