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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5158617a62dd69904cbc0ea1e5f12090c894a4f4ae93953f3cc2b62ea00369' 
  AND token = 'f0RZIR+EinCSfWMC7JCxNwF6vwkI4b0jKXiOFprktF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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