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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '318dcf02a8f851d6903641d881f7ba5eabac625414557b6106084d80665505bb' 
  AND token = 'lsBGkC9Ta6Sh46A088/jjoawWT7LP21JVnVQuLLwDtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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