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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae75f47253cf194c78dac176e4394eee9be0f6b237c806acbf3d6e1b975cad45' 
  AND token = 'AOx525600EyEfxn9KyKySwH8AdE2Xkza3ULkj4MMsTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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