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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '434054f139e97963e9fae95a5b3e7cd5a078c93d39b6903a7ba7f70d4562b0b5' 
  AND token = 'dZyFWRI0MubwcIJK+aiog/kiVdJuFIj4bQR47Xi0RwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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