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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5232262b56c34d00558744c1220322e256928ce00376992dd52ffc4538be61ba' 
  AND token = 'HaBMkS8066J22t0EKSHu+oRPrVXh95mL9JXZSflY9cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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