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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '756d1ef5a71b4a1bb4c39c6180d53fe85b43c1da8d1478259768a4eadbad97d0' 
  AND token = 'N4E5M9sJcoZCN0OCTNrBX/7hZr4PjusVT+UkL1rwgfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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