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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94a03e8b3159b511034e4040caf6eeecab1d08eb5f43eec5470842101abad56d' 
  AND token = 'FGn5nLwM5N+rHN8Hcc5x7MU8QGKISnMpddOxA/RY7rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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