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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f8f8b0a02a5dccc8457cd339c4752752b49863c87a7dd2d413dc018c43e160a' 
  AND token = 'l//bmCMy8U759idO01Uf5Un3Wifuq9MXJJ2rEjG+oJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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