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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '71abd2ff501ea62445668d46d78836809f8f32ee9c5091296214af55093a7c74' 
  AND token = 'puQAcKR1nzztafkru5g+YM86F8tcGgEou7ErKq51DC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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