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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a85395e324ac0dad5dcf4da8a52cd8397178c2c88e7e50d047bd5cce4d01a909' 
  AND token = 'OXDFwa4zzarBbtIYWPlJlaKc8Za7R+v4QIPvrrzugws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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