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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b166c255206974b1363340b33dc67f66c6ff132d44b83038b11a688b337245b' 
  AND token = 'DRu0WFco2Y57cuFDrsiNU1/J5SKmONXZ4TEWs2ZlJUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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