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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f8a41ceaa347f0d73f266ae2fa022703dff4f20b82ddcae3d49d3609e1572f8' 
  AND token = 'riCpoJHN4owbeX6NFOk0t53Jct0ptAOy50ahmovzDg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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