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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5ba42ada83781bfd053fc927000ca9b03923b98bdc56e91dfca91c8f1a5af6a' 
  AND token = 'XZ+vjNdko3+YUyyWAubMklNCG4GRrgMO3/3DnYY5G9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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