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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '410b957b93146b6fdd998b34b0ad70d5640c7ddb0f4fdeb8811c0259dd370b3e' 
  AND token = 'fh4ASVlobafVpIkAH8dI+idKf1voul5stvTzoTgjusI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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