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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20ff83cf809aa0ad6fde2e711e8c729e506fcee0d542925aba792495831844c' 
  AND token = 'Kr24JWdvqtBKkKyuoE//ew5I964Xf0eMgDwNbNCTe/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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