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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fc52f71a3a36ba3b43fcfe44c282e69214662374da90338a1caa492436a2922' 
  AND token = '+0k4YPyzX1QpOzbDn8RjkhkNJDEct89WU3WKkuZ+T6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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