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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cbd32f79dfa2844e023c2d5a12053e4d4814b95747c30481ea612ab3c88f9c4' 
  AND token = 'pFvJyNsJC7EK0MI29zUbpNU4ZaI43BTVqK+iufkirrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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