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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd03cce6a4e29758b587b6079786cb76bdd86f68ad2e42ca4b07f00adda92a24c' 
  AND token = '7wglvpEQxjRJSdFkdnxN9CdFAYJAyBpsC5jcWhYojqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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