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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75d62b14bd09c393c193b5276f7d20b99676ba928fc875bd01b1c93724a58618' 
  AND token = 'cSUOl5+D0IU5p1C3TgDJPvxoxvv0883Ng0v1oNPCErU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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