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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2df4b757f8287cf683c97b06cb13c932227bb6aba5825ef5c1d638ad3a78c3d' 
  AND token = 'eBA9dDnRavbET04PjeFdnN4H6sSW0zjsb0CAqlfD+kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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