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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd967fa366d226480127527f2992d64fb2474db4c4da8ab89588cf82b6a9064d3' 
  AND token = 'Fdr4jScKVPwfmQWU8y8dPHw3+5I7zLXc9Ab5zWjpfw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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