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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b2bcfbb863d0080ef8b93e83ff0dcb2b85916436d2538bbdeae8a5c3ad598fe' 
  AND token = 'c3tuKhQ11cssOj0AIruHsZlUb/uUa1YfmZjsqcm4bvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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