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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aa47620f0685086d06112d671e06952df6de5090073a8ec9deb4110294db771a' 
  AND token = 'v3Vqz3G2yyHtHk0OHqfN/JNZGC0mduFzp3slr9XgUd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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