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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb1d8716f9fa024aa3009ce15d4895ec17b160884b190c70ea35746f875942fa' 
  AND token = 'Q4S/kEH1nuc8d9zm9x0gwMqlriXQyPO/Dy4178VQBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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