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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'da574269203ebe05e0efe2c0499dc43d0b6fbdc60abaa24d2f6739c1a218d1a4' 
  AND token = 'akjRuFAfHp+9z7/Bkq26TTs5RTa3LoQrbzft0OWVee0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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