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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c2c1dfa4d46e64e110085ec3e5be7192c53bc161b1982c39933a806463667f6' 
  AND token = 'auXIYeK/s9rIs0AjHSdAq3+4XnG38CAxUFUjJZq8R3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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