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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31bcdb422799f093080a33464bbc35eb4fae30ef25f8a697f21c363c7c126ddf' 
  AND token = '3FFnsWPDH0t09EE2SOtIgXmnoz2zr4GhnwqoSIM6fCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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