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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '577d1f1a797fe567a08cffe95ca21f5330084d9a416a60a49aa714dd7f37f7a2' 
  AND token = 'hqbTc1EAAzD1E7Bv9xei40D5SlLwpliezV6nmEgHqXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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