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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5dd2b24fe7b35093c9fabb744c8b619ec41626ea6e090de78a4c325b0ea84a9d' 
  AND token = 'boY4nvDCoi3RTXLiyRj/H5OFpxoxQD0vp3DCt/jvCIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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