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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f8a9cdbb9a5ad5a124ae9280d07c5ec3a79b8ca971d5c3b8a08648c705f42cb' 
  AND token = '16npGnQq1V4rFhsG39IXKJRNtb+RWNNaFXVs1StShl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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