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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91a5cc6291d3ace26260f2cfefd9f7a6b8f9b3c4623493bdf7c89193fafd82ba' 
  AND token = 'VAAQYMgzfWEuW7ae2LPRBMTN+FP+hiFCQV8fam/uUio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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