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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '43d843eb073ae7677a91faa57326ee440baf7325888945b0d2cfd1667e866e90' 
  AND token = 'fT1GzEZgVe/LyDTac70cTp2rFrI95G2q7g2ncOzUr9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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