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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '477c792f87f6c3920c14a88119cd8378115107143f972544ff227e4987875049' 
  AND token = '/U29EnvkX431wkz2w5g5p3grsHtcB08FCTe5w9Ldfbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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