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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58ca938b3a89e7732cf3e9cc5ed5f7dfacf15ae2354117944074b2cc95defab2' 
  AND token = '0a9puFoeOLCXfF6tg0a7ckJruIkcXu1uZCwfwRjJeQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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