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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '778edadc464149543aa55f5064ba28d52d066a675dc1114fcbe952499f5a3103' 
  AND token = 'Csb/YcBk02b1cpQtmTdKjZ/ccsQNH3K5CqrJaOBXRxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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