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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4384c95ee01d9d434b22faf8aa369100f58b8098b9ea59936951a824a956928' 
  AND token = 'rq/XqBvem2QkVrju+zi2txAvdCC5Cs3TkNlsxQz3DyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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